EP1162067B1 - Method and means for disengaging a printed sheet from a cylinder - Google Patents

Method and means for disengaging a printed sheet from a cylinder Download PDF

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Publication number
EP1162067B1
EP1162067B1 EP01112212A EP01112212A EP1162067B1 EP 1162067 B1 EP1162067 B1 EP 1162067B1 EP 01112212 A EP01112212 A EP 01112212A EP 01112212 A EP01112212 A EP 01112212A EP 1162067 B1 EP1162067 B1 EP 1162067B1
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EP
European Patent Office
Prior art keywords
cylinder
waves
printing
printing material
source
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EP01112212A
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German (de)
French (fr)
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EP1162067A1 (en
Inventor
Eckart Dr. Frankenberger
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Heidelberger Druckmaschinen AG
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Heidelberger Druckmaschinen AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F21/00—Devices for conveying sheets through printing apparatus or machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/001—Ink mist preventing means

Definitions

  • the invention relates to a method and a device for detaching a printing substrate from a cylinder in a printing machine processing machine.
  • DD-PS 104 753 such a device is described in which in a gore-shaped space between a blanket cylinder and a printing material compressed air with about 2 atü is blown in order to keep a so-called break-off angle of the printing material constant.
  • the inventive method for detaching a substrate from a cylinder in a substrate-processing machine is characterized in that waves are directed in a gore-shaped space between the substrate and the cylinder.
  • the waves are ultrasonic waves. Since the frequency of the ultrasonic waves is above 20 kHz and thus outside the human hearing range, a noise annoyance is advantageously excluded.
  • a central jet of waves or ultrasonic waves is directed directly to the substrate to the cylinder spanning, pasty liquid threads, the liquid residual film on the cylinder of the ultrasonic waves virtually untouched remains.
  • the frequency of the ultrasonic waves is above 30 kHz and preferably above 40 kHz.
  • a frequency of about 50 kHz is preferred.
  • the device according to the invention for detaching a printing substrate from a cylinder in a printing machine processing machine is characterized in that at least one wave source is aligned with a gore-shaped space between the printing substrate and the cylinder.
  • This device suitable for carrying out the method according to the invention advantageously consumes less energy for exciting the at least one wave source in comparison with a blow bar used to detach it (DD-PS 104 753) or the like.
  • the at least one wave source is preferably designed as at least one ultrasound source.
  • the ultrasound source (s) is (are) designed as a piezoelectric element (s).
  • the at least one ultrasound source can thus be installed relatively deep in the gore-shaped space and close to the tear line in the machine.
  • the wave or ultrasonic source (s) arranged close to a pressure nip, the cylinder together with a Impression cylinder forms.
  • the printing material processing machine as a coating machine and the cylinder as a job cylinder.
  • the cylinder may be provided in its function as the application cylinder in the coating machine for applying an adhesive or glue layer on the substrate.
  • central jets of the wave or ultrasound sources are directed onto one and the same focus formed by the liquid threads at the tear line.
  • ultrasonic lens which is designed as a part having a frequency corresponding to the ultrasonic, cup-shaped around a focus curved part and throws all ultrasonic waves on the lying in the region of the fluid filaments focus.
  • the ultrasound sources are inclined upward and / or downward relative to one another in such a way that the central beams of the ultrasonic waves emitted by the ultrasound sources meet in the focus.
  • the wave source (s) may (but) as light or heat radiator, for. B. as a halogen tube, be formed.
  • the machine processing the printing material is preferably a printing machine which prints by an indirect printing method and has a printing form cylinder and an impression cylinder leading to the printing material.
  • the cylinder, from which the printing material is detached, is in this case arranged between the printing form cylinder and the impression cylinder as a blanket cylinder for ink transfer.
  • FIG. 1 a machine 2 processing a sheet-shaped printing material 1 is shown in section.
  • the detail shows an offset printing unit designed as a rotary printing machine 2, that consists of a printing form cylinder 3, a blanket cylinder 4 and an impression cylinder 5 with at least one gripper system 6 for holding the printing material 1.
  • the blanket cylinder 4 is covered with a good QR (quick release) properties having rubber blanket, but it can not be completely avoided that the substrate 1 after passing through a printing nip 7 with its printed in the offset printing unit sheet side on the blanket cylinder 4th sticks and is lifted by the impression cylinder 5.
  • the size of a Abrisswinkeis ⁇ lying between the printing nip 7 and a tear line 8 of the printing substrate 1 is dependent on the tackiness (tack value) of the ink printed by the blanket cylinder 4, the paper quality of the printing substrate 1 and the peripheral surface speed of the blanket cylinder 4 corresponding to the machine speed ,
  • the printing ink located between the printing substrate 1 and the blanket cylinder 4 forms so-called tear-off threads 9 - cf.
  • Figure 2 - which are selectively divided by means of several piezoelectric ultrasonic sources.
  • Ultrasonic waves 13, 14 and 15 of the ultrasound sources 10, 11 and 12 are focused on the tear-9, so that by the action of the ultrasonic waves 13, 14 and 15 impinging on the tear-off threads 9, the tackiness of the ink locally in the tear-off 9 by 90% or is reduced more and tearing the tearing threads 9 easier.
  • the invention is based on the recognition that in a labile system of complex crosslinked influences, such as e.g. the properties of the blanket and the printing substrate 1 and the machine speed, in which system least changes of influencing variables, such as e.g. Machine speed, the result can change greatly, a strong, defined, additional influence must be introduced, which superimposed on the unstable system of smaller influences and stabilized in this way.
  • a strong, defined, additional influence must be introduced, which superimposed on the unstable system of smaller influences and stabilized in this way.
  • the property of the ultrasonic waves 13, 14 and 15 is exploited, that they reduce their adhesive capacity on impact with the printing ink down to a value of less than 10% of the initial situation.
  • the targeted and focused use of the ultrasonic waves 13, 14 and 15 creates a line of premature rupture of the tear-off threads 9 directly behind the pressure gap 7.
  • the breakaway angle ⁇ would increase without the application of the ultrasonic waves 13, 14 and 15 with increasing machine speed and decrease with decreasing machine speed.
  • the tear-off line 8 is stabilized, so that the predetermined break-off angle ⁇ with changes in the machine speed is kept constant. Even with changes in other influencing variables, the tear-off line 8 no longer moves back and forth along the circumferential line of the blanket cylinder 4.

Landscapes

  • Printing Methods (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Cleaning In Electrography (AREA)
  • Manufacturing Of Printed Wiring (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Separation, Sorting, Adjustment, Or Bending Of Sheets To Be Conveyed (AREA)

Abstract

The method of removing printed material (1) from a printing cylinder (4) in a printer (2) uses ultrasound (13-15) directed into the nip formed between the printed material sheet and the cylinder. The ultrasound waves can be focussed and have a frequency of approximately fifty kilohertz. Alternatively, electromagnetic waves can be used. An Independent claim includes a machine for carrying out the method.

Description

Die Erfindung bezieht sich auf ein Verfahren und eine Vorrichtung zum Ablösen eines Bedruckstoffes von einem Zylinder in einer den Bedruckstoff verarbeitenden Maschine.The invention relates to a method and a device for detaching a printing substrate from a cylinder in a printing machine processing machine.

In der DD-PS 104 753 ist eine solche Vorrichtung beschrieben, bei welcher in einem zwickelförmigen Raum zwischen einem Gummituchzylinder und einem Bedruckstoffbogen Druckluft mit ca. 2 atü eingeblasen wird, um einen sogenannten Abrisswinkel des Bedruckstoffbogens konstant zu halten.In DD-PS 104 753 such a device is described in which in a gore-shaped space between a blanket cylinder and a printing material compressed air with about 2 atü is blown in order to keep a so-called break-off angle of the printing material constant.

Auf Grund des genannten hohen Luftdrucks, welcher in etwa das Zehnfache des bei Blaseinrichtungen zur Bogenführung in Bogenrotationsdruckmaschinen üblichen Luftdrucks beträgt, ist der Druckluftverbrauch trotz einer gesteuerten Zufuhr der Druckluft sehr hoch und ist der Betrieb der Vorrichtung mit einer Lärmbelästigung verbunden.Due to the said high air pressure, which is about ten times the usual in blast devices for sheet guiding in sheet-fed rotary printing machines air pressure, the compressed air consumption is very high despite a controlled supply of compressed air and the operation of the device is associated with a noise annoyance.

Fernerer Stand der Technik ist in der DE 196 13 963 A1 beschrieben.Further prior art is described in DE 196 13 963 A1.

Deshalb liegt der Erfindung die Aufgabe zu Grunde, ein Verfahren und eine Vorrichtung zum Ablösen eines Bedruckstoffs von einem Zylinder zu schaffen, bei denen keine Lärmbelästigung auftritt und der Energieverbrauch niedrig ist.It is therefore an object of the present invention to provide a method and apparatus for detaching a substrate from a cylinder in which no noise pollution occurs and power consumption is low.

Die gestellte Aufgabe wird durch ein Verfahren mit den Merkmalen des Anspruchs 1 und durch eine Vorrichtung mit den Merkmalen des Anspruchs 9 gelöst.The stated object is achieved by a method having the features of claim 1 and by a device having the features of claim 9.

Das erfindungsgemäße Verfahren zum Ablösen eines Bedruckstoffs von einem Zylinder in einer den Bedruckstoff verarbeitenden Maschine zeichnet sich dadurch aus, dass Wellen in einen zwickelförmigen Raum zwischen dem Bedruckstoff und dem Zylinder gerichtet werden.The inventive method for detaching a substrate from a cylinder in a substrate-processing machine is characterized in that waves are directed in a gore-shaped space between the substrate and the cylinder.

Vorteilhafte Weiterbildungen des erfindungsgemäßen Verfahrens sind in den Unteransprüchen genannt.Advantageous developments of the method according to the invention are mentioned in the subclaims.

Bei einer Lärmbelästigungen absolut ausschließenden Weiterbildung sind die Wellen Ultraschallwellen. Da die Frequenz der Ultraschallwellen über 20 kHz und damit außerhalb des menschlichen Hörbereiches liegt, ist eine Lärmbelästigung vorteilhafterweise ausgeschlossen.In a noise nuisance absolutely excluding training the waves are ultrasonic waves. Since the frequency of the ultrasonic waves is above 20 kHz and thus outside the human hearing range, a noise annoyance is advantageously excluded.

Bei einer hinsichtlich der Vermeidung von Störungen in einem auf dem Zylinder nach einer Flüssigkeitsübertragung, z.B. Druckfarbe- oder Lackübertragung, vom Zylinder auf dem Bedruckstoff verbliebenen Flüssigkeits-Restfilm vorteilhaften Weiterbildung wird ein Zentralstrahl der Wellen bzw. Ultraschallwellen direkt auf sich vom Bedruckstoff zum Zylinder aufspannende, pastöse Flüssigkeitsfäden gerichtet, wobei der Flüssigkeits-Restfilm auf dem Zylinder von den Ultraschallwellen praktisch unberührt bleibt.In terms of avoiding disturbances in one on the cylinder after a liquid transfer, e.g. Ink or ink transfer, remaining from the cylinder on the substrate liquid residual film advantageous development, a central jet of waves or ultrasonic waves is directed directly to the substrate to the cylinder spanning, pasty liquid threads, the liquid residual film on the cylinder of the ultrasonic waves virtually untouched remains.

Bei einer hinsichtlich des Erzielens einer hohen Energiedichte im Bereich einer Abrisslinie des Bedruckstoffes vorteilhaften weiteren Weiterbildung, schneiden sich Zentralstrahlen der aus verschiedenen Richtung ausgesandten Wellen bzw. Ultraschallwellen in einem im Bereich der Abrisslinie liegenden Punkt.In a further development which is advantageous with regard to achieving a high energy density in the region of a tear-off line of the printing stock, central beams of the waves or ultrasonic waves emitted from different directions intersect in a point located in the region of the tear-off line.

Bei einer hinsichtlich einer besonders effektiven Reduzierung des Klebevermögens (Tack-Wert) der pastösen Flüssigkeit durch die Einwirkung der Ultraschallwellen auf die Flüssigkeit vorteilhaften weiteren Weiterbildung beträgt die Frequenz der Ultraschallwellen über 30 kHz und vorzugsweise über 40 kHz. Wenn es sich bei der Flüssigkeit um eine übliche Offset-Druckfarbe handelt, wird eine Frequenz von in etwa 50 kHz bevorzugt.With regard to a particularly effective reduction of the adhesive capacity (tack value) of the pasty liquid by the action of the ultrasonic waves on the liquid advantageous further development, the frequency of the ultrasonic waves is above 30 kHz and preferably above 40 kHz. When the liquid is a conventional offset ink, a frequency of about 50 kHz is preferred.

Anstelle der Ultraschallwellen können auch elektromagnetische Wellen, wie z. B. Licht- oder Mikrowellen in den zwickelförmigen Raum zwischen dem Bedruckstoff und dem Zylinder gerichtet werden.Instead of the ultrasonic waves and electromagnetic waves, such. B. light or microwaves be directed into the gore-shaped space between the substrate and the cylinder.

Mittels der genannten elektromagnetischen Wellen, die sich ebenfalls fokussieren lassen, kann eine lokale Erwärmung der Druckfarbe im Bereich der Abrisslinie bewirkt werden.By means of said electromagnetic waves, which can also be focused, a local heating of the ink in the region of the tear line can be effected.

Die erfindungsgemäße Vorrichtung zum Ablösen eines Bedruckstoffes von einem Zylinder in einer den Bedruckstoff verarbeitenden Maschine zeichnet sich dadurch aus, dass mindestens eine Wellenquelle auf einen zwickelförmigen Raum zwischen dem Bedruckstoff und dem Zylinder ausgerichtet ist.The device according to the invention for detaching a printing substrate from a cylinder in a printing machine processing machine is characterized in that at least one wave source is aligned with a gore-shaped space between the printing substrate and the cylinder.

Diese zur Durchführung des erfindungsgemäßen Verfahrens geeignete Vorrichtung verbraucht im Vergleich mit einer zum Ablösen eingesetzten Blasleiste (DD-PS 104 753) oder dergleichen vorteilhafterweise wenig Energie zum Anregen der mindestens einen Wellenquelle.This device suitable for carrying out the method according to the invention advantageously consumes less energy for exciting the at least one wave source in comparison with a blow bar used to detach it (DD-PS 104 753) or the like.

Vorteilhaften Weiterbildungen der erfindungsgemäßen Vorrichtung sind in den Unteransprüchen genannt.Advantageous developments of the device according to the invention are mentioned in the subclaims.

Vorzugsweise ist die mindestens eine Wellenquelle als mindestens eine Ultraschallquelle ausgebildet.The at least one wave source is preferably designed as at least one ultrasound source.

Bei einer hinsichtlich einer geringen Baugröße der Vorrichtung vorteilhaften Weiterbildung ist (sind) die Ultraschallquelle(n) als Piezoelement(e) ausgebildet. Die mindestens eine Ultraschallquelle kann somit relativ tief in den zwickelförmigen Raum und nah an der Abrisslinie in die Maschine eingebaut werden.In a refinement which is advantageous with regard to a small size of the device, the ultrasound source (s) is (are) designed as a piezoelectric element (s). The at least one ultrasound source can thus be installed relatively deep in the gore-shaped space and close to the tear line in the machine.

Bei einer hinsichtlich der Ausbildung der den Bedruckstoff verarbeitenden Maschine als eine Druckmaschine und des Zylinders als deren Gummituch- oder Lacktuchzylinder vorteilhaften weiteren Weiterbildung ist (sind) die Wellen- bzw. Ultraschallquelle(n) dicht neben einem Druckspalt angeordnet, den der Zylinder zusammen mit einem Gegendruckzylinder bildet.In a respect to the formation of the substrate processing machine as a printing press and the cylinder as the blanket or blanket cylinder advantageous further development is (are) the wave or ultrasonic source (s) arranged close to a pressure nip, the cylinder together with a Impression cylinder forms.

Es sind aber auch Ausbildungen der den Bedruckstoff verarbeitenden Maschine als eine Beschichtungsmaschine und des Zylinders als ein Auftragszylinder denkbar. Beispielsweise kann der Zylinder in seiner Funktion als der Auftragszylinder in der Beschichtungsmaschine für das Aufbringen einer Klebstoff bzw. Leimschicht auf den Bedruckstoff vorgesehen sein.But there are also conceivable training of the printing material processing machine as a coating machine and the cylinder as a job cylinder. For example, the cylinder may be provided in its function as the application cylinder in the coating machine for applying an adhesive or glue layer on the substrate.

Bei einer hinsichtlich eines konzentrierten Einsatzes mehrerer Ultraschallquellen vorteilhaften weiteren Weiterbildung sind Zentralstrahlen der Wellen- bzw. Ultraschallquellen auf ein und denselben bei der Abrisslinie liegenden und durch die Flüssigkeitsfäden gebildeten Fokus gerichtet.In a further development which is advantageous with regard to a concentrated use of a plurality of ultrasound sources, central jets of the wave or ultrasound sources are directed onto one and the same focus formed by the liquid threads at the tear line.

Eine Fokussierung der Ultraschallwellen ist aber auch unter Verwendung einer sogenannten Ultraschall-Linse möglich, welche als ein mit einer dem Ultraschall entsprechenden Frequenz schwingendes, schalenförmig um einen Fokus herum gekrümmtes Teil ausgebildet ist und alle Ultraschallwellen auf den im Bereich der Flüssigkeitsfäden liegenden Fokus wirft.However, focusing of the ultrasonic waves is also possible using a so-called ultrasonic lens, which is designed as a part having a frequency corresponding to the ultrasonic, cup-shaped around a focus curved part and throws all ultrasonic waves on the lying in the region of the fluid filaments focus.

Bei einer hinsichtlich der Lagebestimmung einer horizontalen Abrisslinie vorteilhaften Weiterbildung sind die Ultraschallquellen derart zueinander nach oben und/oder nach unten geneigt, dass sich die Zentralstrahlen der von den Ultraschallquellen ausgesandten Ultraschallwellen in dem Fokus treffen.In a refinement which is advantageous with regard to determining the position of a horizontal tear line, the ultrasound sources are inclined upward and / or downward relative to one another in such a way that the central beams of the ultrasonic waves emitted by the ultrasound sources meet in the focus.

Die Wellenquelle(n) kann (können) aber auch als Licht- oder Wärmestrahler, z. B. als Halogenröhre, ausgebildet sein.The wave source (s) may (but) as light or heat radiator, for. B. as a halogen tube, be formed.

Die den Bedruckstoff verarbeitende Maschine ist vorzugsweise eine nach einem indirekten Druckverfahren druckende Druckmaschine mit einem Druckformzylinder und einem den Bedruckstoff führenden Gegendruckzylinder. Der Zylinder, von welchen der Bedruckstoff abgelöst wird, ist in diesem Fall dem Druckformzylinder und dem Gegendruckzylinder als ein Gummituchzylinder zur Druckfarbeübertragung zwischengeordnet.The machine processing the printing material is preferably a printing machine which prints by an indirect printing method and has a printing form cylinder and an impression cylinder leading to the printing material. The cylinder, from which the printing material is detached, is in this case arranged between the printing form cylinder and the impression cylinder as a blanket cylinder for ink transfer.

Weitere vorteilhafte Weiterbildungen des erfindungsgemäßen Verfahrens und der erfindungsgemäßen Vorrichtung ergeben sich aus der nachfolgenden Beschreibung eines bevorzugten Ausführungsbeispieles und der dazugehörigen Zeichnung.Further advantageous developments of the method and apparatus of the invention will become apparent from the following description of a preferred embodiment and the accompanying drawings.

In dieser zeigt:

Figur 1
eine aus mehreren zusammenwirkenden Ultraschallquellen bestehende Vorrichtung zum Ablösen eines Bedruckstoffes entlang einer Abrisslinie von einem Zylinder und
Figur 2
die Abrisslinie in einer vergrößerten Darstellung als Einzelheit.
In this shows:
FIG. 1
a device consisting of a plurality of cooperating ultrasonic sources for detaching a printing material along a tear line of a cylinder and
FIG. 2
the demolition line in an enlarged view as a detail.

In der Figur 1 ist eine einen bogenförmigen Bedruckstoff 1 verarbeitende Maschine 2 im Ausschnitt dargestellt. Der Ausschnitt zeigt ein Offsetdruckwerk der als eine Rotationsdruckmaschine ausgebildeten Maschine 2, dass aus einem Druckformzylinder 3, einem Gummituchzylinder 4 und einem Gegendruckzylinder 5 mit mindestens einem Greifersystem 6 zum Halten des Bedruckstoffes 1 besteht.In FIG. 1, a machine 2 processing a sheet-shaped printing material 1 is shown in section. The detail shows an offset printing unit designed as a rotary printing machine 2, that consists of a printing form cylinder 3, a blanket cylinder 4 and an impression cylinder 5 with at least one gripper system 6 for holding the printing material 1.

Zwar ist der Gummituchzylinder 4 mit einem gute QR (quick release)- Eigenschaften aufweisenden Gummituch belegt, jedoch kann es in der Regel nicht gänzlich vermieden werden, dass der Bedruckstoff 1 nach dem Durchlaufen eines Druckspaltes 7 mit seiner in dem Offsetdruckwerk bedruckten Bogenseite am Gummituchzylinder 4 haften bleibt und dadurch vom Gegendruckzylinder 5 abgehoben wird. Die Größe eines zwischen dem Druckspalt 7 und einer Abrisslinie 8 des Bedruckstoffes 1 liegenden Abrisswinkeis α ist von der Klebrigkeit (Tack-Wert) der mittels des Gummituchzylinders 4 verdruckten Druckfarbe, der Papierqualität des Bedruckstoffes 1 und der mit der Maschinengeschwindigkeit korrespondierenden Umfangsoberflächengeschwindigkeit des Gummituchzylinders 4 abhängig.Although the blanket cylinder 4 is covered with a good QR (quick release) properties having rubber blanket, but it can not be completely avoided that the substrate 1 after passing through a printing nip 7 with its printed in the offset printing unit sheet side on the blanket cylinder 4th sticks and is lifted by the impression cylinder 5. The size of a Abrisswinkeis α lying between the printing nip 7 and a tear line 8 of the printing substrate 1 is dependent on the tackiness (tack value) of the ink printed by the blanket cylinder 4, the paper quality of the printing substrate 1 and the peripheral surface speed of the blanket cylinder 4 corresponding to the machine speed ,

Im Bereich der Abrisslinie 8 bildet die zwischen dem Bedruckstoff 1 und dem Gummituchzylinder 4 befindliche Druckfarbe sogenannte Abrissfäden 9 - vergleiche Figur 2 -, welche mittels mehrere piezoelektrischer Ultraschallquellen gezielt zertrennt werden. Ultraschallwellen 13, 14 und 15 der Ultraschallquellen 10, 11 und 12 sind auf die Abrissfäden 9 fokussiert, so dass durch die Einwirkung der auf die Abrissfäden 9 auftreffenden Ultraschallwellen 13, 14 und 15 die Klebrigkeit der Druckfarbe lokal in den Abrissfäden 9 um 90 % oder mehr verringert wird und die Abrissfäden 9 dadurch leichter durchreißen.In the area of the tear line 8, the printing ink located between the printing substrate 1 and the blanket cylinder 4 forms so-called tear-off threads 9 - cf. Figure 2 - which are selectively divided by means of several piezoelectric ultrasonic sources. Ultrasonic waves 13, 14 and 15 of the ultrasound sources 10, 11 and 12 are focused on the tear-9, so that by the action of the ultrasonic waves 13, 14 and 15 impinging on the tear-off threads 9, the tackiness of the ink locally in the tear-off 9 by 90% or is reduced more and tearing the tearing threads 9 easier.

Jede der Ultraschallquellen 10, 11 und 12 ist zusammen mit in der Figur 1 von diesen verdeckten weiteren Ultraschallquellen in einem zwickelförmigen Raum 16 zwischen dem Bedruckstoff 1 und dem Gummituchzylinder 4 in einer zu diesem und zur Abrisslinie 8 achsparallelen und sich über die gesamte Breite des Bedruckstoffes 1 hinweg erstreckenden Reihe angeordnet.Each of the ultrasound sources 10, 11 and 12, together with in Figure 1 of these hidden further ultrasonic sources in a gore-shaped space 16 between the substrate 1 and the blanket cylinder 4 in a paraxial to this and the tear line 8 and over the entire width of the printing material 1 extending away row arranged.

Die Erfindung geht von der Erkenntnis aus, dass in einem labilen System von komplex vemetzten Einflüssen, wie z.B. den Beschaffenheiten des Gummituches und des Bedruckstoffes 1 sowie der Maschinengeschwindigkeit, bei welchem System geringste Änderungen von Einflussgrößen, wie z.B. der Maschinengeschwindigkeit, das Ergebnis stark verändern können, ein starker, definierter, zusätzlicher Einfluss eingebracht werden muss, welcher das labile System kleinerer Einflüsse überlagert und auf diese Weise stabilisiert. Ausgehend von dieser Erkenntnis wird die Eigenschaft der Ultraschallwellen 13, 14 und 15 ausgenutzt, dass diese beim Auftreffen auf die Druckfarbe deren Klebevermögen bis auf einen Wert von unter 10 % der Ausgangssituation herabsetzen. Dabei wird durch die gezielte und fokussierte Anwendung der Ultraschallwellen 13, 14 und 15 eine Linie vorzeitigen Durchreißens der Abrissfäden 9 direkt hinter dem Druckspalt 7 geschaffen.The invention is based on the recognition that in a labile system of complex crosslinked influences, such as e.g. the properties of the blanket and the printing substrate 1 and the machine speed, in which system least changes of influencing variables, such as e.g. Machine speed, the result can change greatly, a strong, defined, additional influence must be introduced, which superimposed on the unstable system of smaller influences and stabilized in this way. On the basis of this knowledge, the property of the ultrasonic waves 13, 14 and 15 is exploited, that they reduce their adhesive capacity on impact with the printing ink down to a value of less than 10% of the initial situation. The targeted and focused use of the ultrasonic waves 13, 14 and 15 creates a line of premature rupture of the tear-off threads 9 directly behind the pressure gap 7.

Der Abrisswinkel α würde sich ohne die Anwendung der Ultraschallwellen 13, 14 und 15 bei zunehmender Maschinengeschwindigkeit vergrößern und bei abnehmender Maschinengeschwindigkeit verkleinern. Auf Grund des durch die Ultraschallwellen 13, 14 und 15 kontrollierten Abrisses der Abrissfäden 9 wird die Abrisslinie 8 stabilisiert, so dass der vorgegebene Abrisswinkel α bei Veränderungen der Maschinengeschwindigkeit konstant gehalten wird. Auch bei Änderungen anderer Einflussgrößen wandert die Abrisslinie 8 nicht mehr entlang der Umfangslinie des Gummituchzylinders 4 vor oder zurück.The breakaway angle α would increase without the application of the ultrasonic waves 13, 14 and 15 with increasing machine speed and decrease with decreasing machine speed. On the basis of the demolition of the tear-off threads 9 controlled by the ultrasonic waves 13, 14 and 15, the tear-off line 8 is stabilized, so that the predetermined break-off angle α with changes in the machine speed is kept constant. Even with changes in other influencing variables, the tear-off line 8 no longer moves back and forth along the circumferential line of the blanket cylinder 4.

Bezugszeichenreference numeral

11
Bedruckstoffsubstrate
22
Maschinemachine
33
DruckformzylinderPlate cylinder
44
GummituchzylinderBlanket cylinder
55
GegendruckzylinderImpression cylinder
66
Greifersystemgripper system
77
Druckspaltnip
88th
AbrißlinineAbrißlinine
99
Abrissfädendemolition threads
1010
Ultraschallquelleultrasound source
1111
Ultraschallquelleultrasound source
1212
Ultraschallquelleultrasound source
1313
Ultraschallwelleultrasonic wave
1414
Ultraschallwelleultrasonic wave
1515
Ultraschallwelleultrasonic wave
1616
zwickelförmiger RaumKick-shaped space
αα
Abrisswinkelstalling angle

Claims (17)

  1. Method of releasing a printing material (1) from a cylinder (4) in a machine (2) processing the printing material,
    characterized in
    that waves are directed into a wedge-shaped space (16) between the printing material (1) and the cylinder (4).
  2. Method according to claim 1,
    characterized in
    that the waves are directed to tear threads (9) adhering to the cylinder (4) and the printing material (1).
  3. Method according to claim 1 or 2,
    characterized in
    that the waves are focused.
  4. Method according to one of claims 1 to 3,
    characterized in
    that the waves are ultrasonic waves (13, 14, 15).
  5. Method according to claim 4,
    characterized in
    that the ultrasonic waves (13, 14, 15) that are used are ultrasonic waves at a frequency of about 50 kilohertz.
  6. Method according to one of claims 1 to 3,
    characterized in
    that the waves are electromagnetic waves.
  7. Method according to claim 6,
    characterized in
    that the electromagnetic waves are microwaves.
  8. Method according to claim 6,
    characterized in
    that the electromagnetic waves are light waves.
  9. Device for releasing a printing material (1) from a cylinder (4) in a machine (2) processing the printing material, in particular for implementing the method of claim 1,
    characterized in
    that at least one wave source is directed to a wedge-shaped space (16) between the printing material (1) and the cylinder (4).
  10. Device according to claim 9,
    characterized in
    that the wave source is an ultrasonic source (10, 11, 12).
  11. Device according to claim 10,
    characterized in
    that the ultrasonic source (10, 11, 12) is of the piezoelectric constructional type.
  12. Device according to one of claims 9 to 11,
    characterized in
    that the wave source is arranged at a printing nip (7) formed by the cylinder (4).
  13. Device according to one of claims 9 to 12,
    characterized in
    that a number of such wave sources are directed to a focus.
  14. Device according to claim 13,
    characterized in
    that the wave sources are directed to the focus in a vertical plane at an angular offset with respect to each other.
  15. Device according to claim 9,
    characterized in
    that the wave source is a light source.
  16. Device according to claim 15,
    characterized in
    that the light source is a halogen source.
  17. Device according to claim 9, 15, or 16,
    characterized in
    that the wave source is a heat emitter.
EP01112212A 2000-06-09 2001-05-18 Method and means for disengaging a printed sheet from a cylinder Expired - Lifetime EP1162067B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10028667 2000-06-09
DE10028667A DE10028667A1 (en) 2000-06-09 2000-06-09 Method and device for detaching a printing material from a cylinder

Publications (2)

Publication Number Publication Date
EP1162067A1 EP1162067A1 (en) 2001-12-12
EP1162067B1 true EP1162067B1 (en) 2006-03-08

Family

ID=7645285

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01112212A Expired - Lifetime EP1162067B1 (en) 2000-06-09 2001-05-18 Method and means for disengaging a printed sheet from a cylinder

Country Status (5)

Country Link
US (1) US6550390B2 (en)
EP (1) EP1162067B1 (en)
JP (1) JP2002037497A (en)
AT (1) ATE319565T1 (en)
DE (2) DE10028667A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10311234A1 (en) 2003-03-14 2004-09-23 Heidelberger Druckmaschinen Ag Printing material web processing machine
US7998708B2 (en) * 2006-03-24 2011-08-16 Handylab, Inc. Microfluidic system for amplifying and detecting polynucleotides in parallel
DE102010003011A1 (en) * 2010-03-18 2011-09-22 Manroland Ag Pressure cylinder sheet guiding device for sheet-fed printing machine, has impression cylinder for guiding printed sheet and another cylinder for transferring printed image on printed sheet guided on impression cylinder for supporting sheet

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE104753C (en)
IT991984B (en) * 1972-07-22 1975-08-30 Maschf Augsburg Nuernberg Ag IMPROVEMENT IN OFFSET-TYPE PRINTING MACHINES
DE3344424A1 (en) * 1983-12-08 1985-06-27 Fa. J.G. Mailänder, 7120 Bietigheim-Bissingen Method and device for guiding sheet-metal panels or the like passing through machines for printing or lacquering sheet metal
DE19613963C2 (en) * 1996-04-09 1999-03-04 Heidelberger Druckmasch Ag Device for detaching a sheet from a blanket cylinder of a printing machine
DE19943029A1 (en) * 1998-10-08 2000-04-13 Heidelberger Druckmasch Ag Paper handling system for use with printing machine loosens topmost sheet of paper from stack using sound source and side blower

Also Published As

Publication number Publication date
ATE319565T1 (en) 2006-03-15
DE50109129D1 (en) 2006-05-04
EP1162067A1 (en) 2001-12-12
US20010050018A1 (en) 2001-12-13
US6550390B2 (en) 2003-04-22
JP2002037497A (en) 2002-02-06
DE10028667A1 (en) 2001-12-13

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